Comp. Test Results

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Langlia
Posts: 592
Joined: Mon Dec 14, 2015 11:04 pm
Location: Langley BC

Comp. Test Results

Post by Langlia » Fri Jun 15, 2018 1:37 pm

Cyl 1 - 145
Cyl 2 - 136
Cyl 3 - 136
Cyl 4 - 145

1.6 Xflow 681F Block

How do these look?

I was reading they should be around the 150 Range,

Getting a little oil coming out of the dipstick at the moment not sure if that's because I have too much oil or if the PCV Valve on the block is a little gunned up. Still have to troubleshoot

Langlia
Posts: 592
Joined: Mon Dec 14, 2015 11:04 pm
Location: Langley BC

Post by Langlia » Fri Jun 15, 2018 4:56 pm

Drained about an extra 750mls of oil outta the motor. Dipstick now inbetween Min and Max.

Took guts out of crankcase breather, ran hose to ground. Will tie into catch can system soon.. Need a tee. At high revs with dipstick in hole no more oil shooting out. :)

Brett Wilkie
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Joined: Sun Sep 16, 2012 12:42 pm
Location: Vancouver British Columbia Canada

Post by Brett Wilkie » Fri Jun 15, 2018 8:56 pm

Your X/Flow is young isn't it? From what I have heard and seen these engines have a heavy breathing rate during break-in, I remember my friend telling me his leaked and puked oil until it was run in. I don't know yet on mine as it's no street able yet but I am preparing it with as much crankcase breathing as possible.
Anglia 100e modified
Prefect 100e stock

Langlia
Posts: 592
Joined: Mon Dec 14, 2015 11:04 pm
Location: Langley BC

Post by Langlia » Sat Jun 16, 2018 11:12 am

No no no,

I'm young, the xflow is old. :lol:

Can't tell you anything about the mechanical history of the motor, it's all a mystery.

I pulled the dipstick and the oil ran out at a steady rate, Pulled the crank breather and it ceased.

Might have a leaky rear main.. I see oil collecting on the bottom of the bellhousing. Good news is gearbox is leak free! as is the diff.

Brett Wilkie
Posts: 1613
Joined: Sun Sep 16, 2012 12:42 pm
Location: Vancouver British Columbia Canada

Post by Brett Wilkie » Sat Jun 16, 2018 12:46 pm

Did you do the compression test on a warm engine with the throttles open?
Regarding the crankcase pressure have a look around the internet for breathing ideas, here is just one.
https://forum.wscc.co.uk/forum/topic/53 ... crossflow/
Anglia 100e modified
Prefect 100e stock

JAN
Posts: 169
Joined: Sun Oct 21, 2007 6:57 am
Location: Wigan, UK

Post by JAN » Sun Jun 17, 2018 1:10 am

As Brett says, do it hot with the throttles fully open. Actual peak figures are less important than equality across the lot: the lowest should be within 90% of the highest reading. Then put a small amount of oil down each cylinder and repeat. If the figures rise significantly, it suggests that compression is being lost past the piston rings, but I doubt there'd be a big increase here.

I did a test on my 1500 pre-crossflow (+0.090" = 1588cc) with Stage II head. All came between 155 and 165 p.s.i., and I was very happy with that. It didn't explain why it wouldn't idle on No. 2, though!

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